Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.

Freelancer Stack - Curated directory of tools used by 10,000+ freelancers

Coworkly - Coworkly is a free tool for creative contractors to put freelance bookings, payments, & work goals on auto-pilot!It's a portfolio, scope of work, & invoice bundled into one simple flow that allows clients to reserve your time in a few easy steps.

Freelance Rate Explorer - Visualize rates for thousands of freelance designers & devs

AND CO - AND CO helps freelancers, entrepreneurs and other small businesses run their business smarter.

Freelance TV - Collection of stories and interviews on freelancing